TWI436908B - Vehicle power system - Google Patents

Description

Vehicle power system

The present invention relates to a power system, and more particularly to a vehicle power system.

The engine for the vehicle is easy to turn off at idle speed because the engine cannot drive a crankshaft rotation when the engine speed is low. Generally, the weight of the crankshaft is often used by the counterweight or the flywheel to keep the engine running at low speed. In turn, the vehicle will not be easily extinguished when idling.

Referring to FIG. 1 , a "car single-cylinder air-cooled engine connection structure" disclosed in the CN101413437A patent application, the engine connection structure disclosed in the present disclosure comprises an engine body 11 and a crankshaft 12 connected to the engine body 11. a front flywheel 13 disposed at one end of the crankshaft 12, a rear flywheel 14 disposed on the opposite end of the crankshaft 12 opposite to the front flywheel 13, a transmission gearbox 15 covering the rear flywheel 14, and a drive A transmission gear shaft 16 in the transmission gear box 15 and coupled to the rear flywheel 14.

When the engine body 11 is operated to drive the rotation of the crankshaft 12, the front flywheel 13 and the rear flywheel 14 are respectively disposed at both ends of the crankshaft 12, and the inertia of the rotation of the crankshaft 12 is enhanced to operate the crankshaft 12. Medium smooth, low transmission power loss.

Although the above-mentioned connecting structure can increase the inertial force of the engine and make the output power smooth, the invention discards the belt transmission mode in order to obtain a small transmission power loss, so that the operation is required for the use of the gear, so that the utility is practical. And the convenience is poor, the market acceptance is not high, in addition, the structure has the following disadvantages:

1. Low generality

Since both the front flywheel 13 and the rear flywheel 14 are disposed on the crankshaft 12, the installation space needs to be increased on the crankshaft 12. Therefore, the engine-related parts need to be redesigned, and it is not easy to be on the factory or existing engine body 11. The front flywheel 13 and the rear flywheel 14 are added, so the versatility is not high.

2. Increased volume and large vibration

As described above, since the installation space needs to be increased on the crankshaft 12, the engine is made large, and the rear flywheel 14 is away from the center line L1 of the engine, so that a large vibration is generated when the crankshaft 12 rotates.

3. Complex structure and high manufacturing cost

Since the rear flywheel 14 is interlocked with the transmission gear shaft 16, the design difficulty is increased, and the strength of the rear flywheel 14 during rotation is also considered together. Therefore, the structure of the rear flywheel 14 is complicated, which will result in manufacturing and materials. The increase in costs has led to a decline in product competitiveness.

Accordingly, it is an object of the present invention to provide a vehicle power system that is low in speed, stable, highly versatile, and simple in construction.

Therefore, the vehicle power system of the present invention comprises a crankcase, two bearings fixed to both sides of the crankcase, a crankshaft that passes through the bearing and protrudes from the crankcase at both ends, a power generating unit, and a belt driving wheel. a first flywheel disposed on the power generating unit and a second flywheel disposed on the belt driving wheel.

The crankshaft has two weights in the crankcase, the power generating unit is located outside the crankcase and is disposed at one end of the crankshaft, the belt driving wheel is disposed outside the crankcase, and the belt driving wheel comprises a a fixed wheel on the crankshaft, a movable wheel arranged on the crankshaft and spaced apart from the fixed wheel, and a swash plate mounted on the movable wheel. The second flywheel is detachably disposed on the movable wheel of the belt driving wheel, and is viewed from the radial direction. When the movable wheel is displaced to the position closest to the swash plate, the second flywheel does not Projected from the bottom of the swash plate.

The utility model has the advantages that the rotational inertia of the vehicle power system is enhanced by the arrangement of the first flywheel and the second flywheel, so that the vehicle power system is not easily extinguished at a low rotational speed, thereby lowering the idle speed of the vehicle power system. At the same time, the first flywheel and the second flywheel are respectively at both ends of the crankshaft and adjacent to the center of the vehicle power system, and the weight of the two ends of the crankshaft can be balanced to reduce the vibration generated when the crankshaft rotates.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of FIG.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, the vehicle power system 2 of the present invention, in particular, an engine 3 for a vehicle, the first preferred embodiment of the vehicle power system 2 includes a crankcase 31 and two fixed to both sides of the crankcase 31. a bearing 32, a crankshaft 33 that passes through the bearing 32 and protrudes from the crankcase 31 at both ends, and a piston 34 that drives the crankshaft 33 to operate relative to the crankcase 31. A power generating unit 4 disposed outside the axle box 31 at one end of the crankshaft 33, a belt driving wheel 51 located outside the crankcase 31 and disposed on the crankshaft 33 opposite to the power generating unit 4, and a belt driving wheel 51 A spaced-apart belt driven wheel 52, a belt 61 wound around the belt driving wheel 51 and the belt driven wheel 52, a shifting gear box 62 connected to the belt driven wheel 52, and a shifting gear box 62 The rear wheel 63, a first flywheel 71 disposed on the power generating unit 4, and a second flywheel 72 disposed on the belt driving wheel 51.

The crankshaft 33 has two weight portions 331 located in the crankcase 31, defining a center line L2 passing through the center of the vehicle power system 2, a direction indicated by an arrow X in FIG. 2, and a direction as shown in FIG. The direction indicated by the arrow Y is the longitudinal direction.

Referring to Figures 2, 3 and 4, the belt drive wheel 51 includes a fixed wheel 511 disposed on the crankshaft 33, and a movable wheel 512 disposed on the crankshaft 33 and spaced from the fixed wheel 511. a slanting plate 513 disposed on the movable wheel 512, and three protrusions 514 fixed to the swash plate 513 and slidably inserted into the movable wheel 512, and the second flywheel 72 is annular And detachably disposed on the movable wheel 512 of the belt driving wheel 51 by three screwing elements 8, wherein the screwing elements 8 lock the second flywheel 72 to the belt from the lateral direction. The movable wheel 512 of the driving wheel 51 is axially movable with the belt driving wheel 51. It should be noted that the number of the screw elements 8 is not limited to three, and the second flywheel 72 and the movable wheel 512 are not fixed by screwing, and may be glued, riveted, or integrally formed. Die casting...etc.

Referring to Figures 2 and 4, when the vehicle power system 2 ignites and blasts the piston 34 downwards, and drives the crankshaft 33 to rotate. One end of the crankshaft 33 drives the power generating unit 4 to rotate to generate electric power. At this time, the first flywheel 71 is also driven to rotate, and the other end of the crankshaft 33 drives the belt driving wheel 51. Rotating, at this time, the second flywheel 72 is also rotated. When the rotation speed of the crankshaft 33 is increased, the movable wheel 512 of the belt driving wheel 51 slides along the protrusions 514 toward the fixed wheel 511 and presses the belt. 61. The belt driven wheel 52 rotates by the belt 61. The belt driven wheel 52 rotates while the rear wheel 63 rotates through the transmission gear box 62, thereby transmitting the power output by the piston 34 to the rear wheel. 63. Since the manner in which the belt driving wheel 51 drives the belt driven wheel 52, the shifting gear box 62, and the rear wheel 63 by the belt 61 is understood by those skilled in the art, it will not be described again, and in particular, the movable The manner in which the wheel 512 slides along the protrusions 514 has the effect of reducing wear and noise.

When the crankshaft 33 rotates and the rotation speed is low, the first flywheel 71 and the second flywheel 72 increase the inertia of the rotation of the crankshaft 33, so that the crankshaft 33 can maintain stable rotation when the rotation speed is low, and at the same time, the first flywheel 71 and the second flywheel 72 are respectively located at two ends of the crankshaft 33 to balance the weight of the crankshaft 33, and the first flywheel 71 and the second flywheel 72 are adjacent to the center line L2 of the vehicle power system 2, Therefore, the vibration generated by the crankshaft 33 during the rotation can be reduced. In addition, since the second flywheel 72 is disposed, the belt drive wheel 51 does not transmit the rear wheel 63 through the belt 61 when the rotation speed is low, and the diameter is changed. Towards, when the movable wheel 512 is displaced to the position closest to the swash plate 513, the second flywheel 72 does not protrude from the bottom of the swash plate 513, thereby reducing the vehicle power system 2 at the time of idling. Load, into It is more capable of reducing the speed of the vehicle's power system 2 at idle.

Moreover, the second flywheel 72 is combined with the movable roulette 512 of the existing belt driving wheel 51, and the size of the existing vehicle power system 2 is not required to be changed, and the second flywheel 72 has a simple shape and is easy to install, and can be applied to existing vehicles. On the power system 2, the problem of reducing the rotational speed of the vehicle power system 2 at an idle speed causes an unstable operation or even a flameout of the vehicle power system 2 to be immediately improved.

Referring to FIG. 5, a second preferred embodiment of the vehicle power system 2 of the present invention is substantially the same as the first embodiment, except that the screw members 8 lock the second flywheel 72 from the longitudinal direction. The effect of the first preferred embodiment can also be provided on the movable sheave 512 of the belt drive wheel 51.

Referring to Figure 6, a third preferred embodiment of the vehicle power system 2 of the present invention is substantially the same as the first embodiment, except that the second flywheel 72 includes three projections 721 to reduce material usage and reduce The cost, and when the second flywheel 72 is damaged, does not need to be completely replaced, and only the protruding portion 721 of the damaged soil can be replaced, which has the advantage of being convenient for maintenance.

With the above-described design, the vehicle power system 2 of the present invention has the following effects in use:

(1). Improve the stability of the vehicle power system 2 at idle and reduce the speed at idle:

Since the second flywheel 72 is added, the rotational inertia of the crankshaft 33 is increased, so that the vehicle power system 2 is better stabilized at a low rotational speed, and the vehicle power system 2 is also prevented from rotating the rear wheel 63 when idling, reducing Vehicle power system 2 is at idle speed, thus reducing vehicle power The speed of the system 2 at idle is also not easy to extinguish.

(2). Highly versatile, can be installed on existing vehicles:

Since the second flywheel 72 is disposed on the movable wheel 512 of the belt driving wheel 51, the structure of the existing vehicle power system 2 and the redesign related components are not required to be changed, and the second flywheel 72 can be widely applied to the existing one. On the vehicle.

(3). Simple construction and reduced manufacturing costs:

Since the second flywheel 72 is annular, the structure is simple, and it is easy to mass-produce and manufacture, and the cost of developing a new mold is saved, the cost of adding the second flywheel 72 is reduced, and the manner of locking by the screwing elements 8 is achieved. The installation is easy and fast, and the manpower and material resources used in the installation are minimized.

(4). Reduce the vibration, noise and fuel consumption during the operation of the vehicle power system 2:

As described in (1), since the rotational speed of the vehicle power system 2 at the idling speed can be lowered, the fuel consumption of the vehicle power system 2 at the time of idling is also reduced, and the first flywheel 71 and the second flywheel 72 are Located at both ends of the crankshaft 33 and adjacent to the center of the vehicle power system 2, the weight of both ends of the crankshaft 33 is balanced, thereby reducing the vibration and noise generated by the vehicle power system 2 at a constant speed, and when the movable roulette is In the process of moving 512 for shifting, since the second flywheel 72 is disposed on the movable sheave 512 of the belt drive wheel 51, the movable sheave 512 can be absorbed while the movable sheave 512 presses the belt 61 for shifting. Vibration when moving.

In summary, the vehicle power system 2 of the present invention is designed to improve the stability of the vehicle power system 2 at idle speed and reduce the speed and constant speed when the first flywheel 71 and the second flywheel 72 are structurally designed. The vibration can further reduce the rotational speed of the vehicle power system 2 at an idle speed. At the same time, the second flywheel 72 has a structure and an easy-to-manufacture shape, and can be applied to an existing vehicle, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2‧‧‧Vehicle Power System

3‧‧‧ engine

31‧‧‧ crankcase

32‧‧‧ Bearing

33‧‧‧ crankshaft

331‧‧‧With weights

34‧‧‧Piston

4‧‧‧Power generation unit

51‧‧‧Belt drive wheel

511‧‧‧Fixed roulette

512‧‧‧ movable roulette

513‧‧‧ sloping plate

514‧‧‧Bump

52‧‧‧Belt Passive Wheel

61‧‧‧Land

62‧‧‧Transmission gearbox

63‧‧‧ Rear wheel

71‧‧‧First Flywheel

72‧‧‧second flywheel

721‧‧‧protrusion

8‧‧‧ screw components

L2‧‧‧ center line

X‧‧‧ arrow

Y‧‧‧ arrow

1 is a cross-sectional view showing a "vehicle single-cylinder air-cooled engine connection structure" disclosed in the Japanese Patent Publication No. CN101413437A; FIG. 2 is a cross-sectional view showing a first preferred embodiment of the vehicle power system of the present invention; Is a partial exploded view showing the arrangement relationship between a second flywheel and a movable wheel of the first preferred embodiment; FIG. 4 is a cross-sectional view for assistance in explaining FIG. 3; and FIG. 5 is a cross-sectional view illustrating the vehicle of the present invention. A second preferred embodiment of the power system; and Figure 6 is a perspective view of a third preferred embodiment of the vehicle power system of the present invention.

2. . . Vehicle power system

3. . . engine

31. . . Crankcase

32. . . Bearing

33. . . Crankshaft

331. . . Counterweight

34. . . piston

4. . . Power generation unit

51. . . Belt drive wheel

511. . . Fixed roulette

512. . . Movable roulette

52. . . Belt passive wheel

61. . . Belt

62. . . Gearbox

63. . . rear wheel

71. . . First flywheel

72. . . Second flywheel

L2. . . Center line

X. . . arrow

Y. . . arrow

Claims (5)

A vehicle power system includes: a crankcase; two bearings fixed to both sides of the crankcase; a crankshaft that passes through the bearing and protrudes from the crankcase at both ends, the crankshaft having two slots in the crankcase a power generating unit is disposed outside the crankcase and disposed at one end of the crankshaft; a belt driving wheel is disposed outside the crankcase, the belt driving wheel includes a fixed rotating disc disposed on the crankshaft, and a a movable roulette disposed on the crankshaft and spaced apart from the fixed reel, and a swash plate disposed on the movable reel; a first flywheel disposed on the power generating unit; and a second flywheel, Removably disposed on the movable wheel of the belt driving wheel, and viewed from the radial direction, when the movable wheel is displaced to be closest to the swash plate, the second flywheel does not protrude from the swash plate bottom of. The vehicle power system according to claim 1, further comprising a plurality of screwing elements, the second flywheel being locked to the movable wheel of the belt driving wheel by the screwing elements. The vehicle power system of claim 2, wherein the second flywheel includes a plurality of projections. The vehicle power system of claim 2, wherein the screw elements lock the second flywheel from the lateral direction to the movable wheel of the belt drive wheel. The vehicle power system of claim 2, wherein the screw elements lock the second flywheel from the longitudinal direction to the movable sheave of the belt drive wheel.